Sonic smiled in his sleep as he felt himself curled next to his sister and his sister curled up next to him. They looked like a pair of mates where one was protective of the other, and the other one was protective of his or her mate. But they weren't mates, so it was more like a pair of overgrown kits, since Sonic and Sonya would often curl up against each other like that they were small and Mobian hedgehog kits, when there was more than one, would do that to keep warm since they had a hard time maintaining their body temperature. 

It took Knuckles a while to fall asleep, but he did managed to find sleep eventually. But not before sneaking out of the building to look at the stars, which often helped him sleep when he couldn't, though he never found out why that was the case.